STi 5 OEM HARDWARE'S MAPPED BHP POTENTIAL...???
 

Does anyone know the ballpark area that the STi 5's VF28/440cc/TMIC combo maxes out at, post mapping?

I'm guessing the TMIC is (marginally) the limiting factor out of the 3 and no doubt caps things at c.330bhp ???

Im running all the above on 'my' MY99 type R (simtek) and its about 310bhp.

Believe 330 is max? :thumb:

Cheers - thought it would be in this sort of area.

So really, the swapping to 550cc injectors not necessarily needed at this level (440s do c.330-340 I think).

My guess would be if you changed to an Sti8 top mount, 550cc's you would be pushing more like 340bhp...

Im sure the VF28 runs out of steam then though?

As said at this standard level, pretty unecessary me thinks :thumb:

lol I actually have a 20g/550s/FMIC/FPR/3-port, etc, etc to fit/map.

But in the meantime I was looking to get a 'safety' map done first (the car's a fresh import see). I want peace of mind.

Ah now you say :D

When I got mine 2 years ago I went for the MAF-less simtek as the MAF failed 3 times in as many months due to the induction kit me thinks. Now its all sorted for 99ron fuel, its been happy ever since!

You dont have the option of not driving it then till mods/final map have been carried out?

Seems a waste of your hard earned to essentially map twice? or maybe its just me :D

Yeah I know it makes sense to get all my stuff fitted/mapped at once, but can't get my ass into gear to get it done lol.

The car has equal length tubular headers and sportscat as fitted by the previous Jap owner, so want to get EcuTek map asap for my own sanity.

I also have a Z32 MAF which I'll fit/map to get round the MY99/00 MAF issues. Who knows, when I get all the other stuff fitted, may move to MAFless Simtek too!..... If I'm feeling flush. :D

Will it still burble with those headers?

To be honest if my MAF hadnt had failed so many times, I would have just EcuTek'd it, but the option was there to go MAFless with the simtek, apart from being a wicked ecu, it has no real benefits towards me, just one less thing to fail :D

20g/FMIC/550s/3 port/FPR <--- what do you mean 'if' your feeling flush... ha!

Headers/sportscat already on by previous owner (hence my anxiety re a remap asap).

No, the burble has totally gone (gas pulses now lining up equally behind each other). Plus it has a Jasma back box on which also makes it v. quiet. I expect mine is one of the quietest Impreza's out there lol. But will be fitting a Prodrive back box to regain an OEM look, and give a bit more of a soundtrack when chasing the throttle...

I'd say around 320 with that turbo and tmic maximum.

Def would go simtek though rather than spending out on ecutek and still having maf issues. Will work out cheaper in not too much time.

Most of my customers don't have MAF issues, and I would say that 99% that are still on the OEM airbox have no issues whatsover, so it would take some years for the simtek to pay for itself!

Paul you hit the nail on the head the standard airbox, my brother sold his sti 5 type r to a customer of yours and in the 3 years he had it changed the maf once. Mainly due to precaution rather than it being goosed.

Banny

If you want an engine and big turbo, fmic and so on, then Simtek would be the way to go, but I also have customers running 450hp with a MAF on a PowerFC.

Paul/Duncan

I've already bought a 2nd hand EcuTek'd ECU (licence paid for by previous owner), ready to be swapped over for a new full overwritten remap.

I do also have a Z32 MAF lying around -- so nothing stopping fitting/wiring the more robust Z32 (relatively speaking) and getting that new EcuTek map.... A good way round the Simtek cost + MY99/00 alleged MAF "issues", do you agree?

If I was in your shoes, and the car currently has a tidy panel filter with a green stripe sensor less two-three years old, and if your Z32 part is secondhand, I would probably leave it as-is rather than go out of my way to fit the Nissan unit.

As written elsewhere it's impossible to know how much of the 99/00 sensor's "reputation" on here is accurate, how much is down to experience with the (now obsolete) revision 1/2 sensors, and how much down to pure Scoobynet hyperbole. In that context, Paul's comments above are very illustrative.

A rhetorical question: How do you know (relatively speaking) that your Nissan MAF Nissan would be more reliable/accurate/robust than the airflow meter currently in your car, or the brand new one you could buy from Subaru tomorrow? As far as the precautionary principle goes, the logic for converting a classic to fit a brand new newage/Nissan/etc airflow meter is sound. The logic for fitting some of the old, secondhand sensor types is now starting to look a little flawed.

Splitpin, the Z32 I bought was claimed as being "brand new" (haven't fitted it to any car since buying it, either).

Was under the impression that the MY93-98 style of MAF sensing element was less likely to go wrong than a MY99/00 one. Plus I was looking at adding a "MAF-weakening" K&N cone/trumpet combo either now (for the remap)... or indeed when I get the 20g/550/FM/FPR/3-port etc fitted/mapped.

Funny you should post about my MY99 MAF - was intending to take a photo of my one's green marking for YOU, Splitpin, to evaluate the "type". In fact, gonna do it soon and post it on here........... ;)

Echo above.

Simtek better, albeit more expensive alternative, to Ecutek for a classic. Quite apart from the MAF issue, you'll just get a better map with the former, including:

- No fu*king annoying emissions related boost cut (a feature that can't be mapped out of the original ECU)

- Better boost control including in gear boost compensation (you want this!)

Worth it for the above two reasons alone in my view!

Ns04

Yes it can, who told you that?

That can be done on 99-00 OE ECU too, albeit with a little more difficulty than the above.

Well, that's one plus point in its favour. Even then if the proper one is as I described above, I'm not sure you have a positive reason to change it.

That might be Scooby folklore, and it might have been correct eight years ago, but I'm not sure it is now.

If it's a K&N cone, and provided it's properly mounted (i.e. retains the OE airbox's decoupling), it won't weaken the MAF

If it has a stripe/dab of green paint across the top of the mounting flange it's the (good/current) post-2005 type. If it doesn't have paint there, it's a pre-2005 type and should be replaced immediately.

If it does have the green stripe, either undo the two retaining bolts and rotate the sensor round, or use a mirror, to read off the four digit code on the lower rearward face of the flange. The first digit is the year of manufacture.

SP, the signs are good!...

http://i267.photobucket.com/albums/i.../MY99MAF-1.jpg

I take it that is a green "stripe" and not a "dot"?

If so, then the white 4-digit code on the underside (out of view and opposite to the white long code you see in the pic) reads: 6X31. Does this mean it's a 2006 MAF?! :)

Hiya Splitpin,

Always nice to have your contribution to these threads. :)

1) It was either Bob or JGM, if I recall correctly, maybe both lol! I remember it being present on both remaps I had on the std ECU. Complete PITA!

2) I had heard of a way of achieving this actually, however, my understanding is that -even with the above in mind- the JECS ECU compares poorly to the Simtek with respect to boost control. Put it this way. I went from Ecutek with AVC-R to Simtek and found the latter significantly better. Same mapper (Bob) on both.

3) As an additional "perk" of the Simtek, I found small throttle transitions to be much smoother with the Simtek than the std ECU and, of course, the Simtek negated the maf reversion that resulted from running no DV with the std ecu and maf sensor.

Obviously, I bow to your far superior technical knowledge; just pointing out my experience of a customer running a MY99 with Ecutek, Ecutek and AVCR and Simtek.


Best,

Ns04

Yeah, that's a stripe one alright. The "dot" on the green dot ones is on the business end, not the mounting, and they don't have the extra white text. And, yep, the 6 is 2006 manufacture.

You might want to take a view on that. I've got an 06 batch in mine at the moment, and, touching wood, it's still absolutely 100%, after something like 30,000 miles. However, if was in your shoes, i.e. had just bought a car of unknown history and didn't have access to the kit I've got, I might be tempted to put a new one in just for piece of mind. That obviously opens the question of replacing with a genuine like for like or using the Nissan one.

Hmmm, in which case, I suppose we could say that there is a marked difference between the product Ecutek appear to be offering to their customers and the technical capability of the hardware in the car.

Still back to joz's original post I still think that a MAFless ecu such as Simtek is the right solution. There is no doubt that it will fully earn its place on the spec he has lined up. it would be silly to pay for oe remap then have to do the same for a full remap on simtek when he makes the decision to change. Will save all the maf issues as to whether they are reliable, will stretch that far etc etc

if that is the planned route then simtek would be better solution..

Simon

Sack it, I've got the cash (inheritance came through 3 weeks ago! lol)... Think I'll get Simtek when I fit all the "big" mods previously listed, then be done with all the anxiety re MAFs. :)

Alternative is to get it wideback and detcan checked now so you know it is safe or not..

then fit all the bits you have and get the simtek fitted and mapped in one session rather than two.

Simon

Good point.

Actually Simon, I have bought that second hand EcuTek'd ECU (from that other thread, remember?). If I was to get you to map it with the mods the car came with (see earlier posts for details), could you also wire up the Z32 (and also fit the K&N cone/trumpet if it'll fit), prior to mapping?

Or will the Z32 (and filter/trumpet) take to much time out of your mapping 'slot' for you to fit?

z32 is not ideal and wouldn't be my choice on a 99.. it is great on the 93~96 as the maf is the same physical size but the 99 has a larger diameter maf.. trying redo the maf scaling for the z32 on a standard 99 ecu wouldn't be fun.

Ah right didn't realise that - forget that then, I'll sell the Z32 on...

Thanks for your sage advice (as always).